Nailing machine



Feb. 15, 1944. L R NELSN. 2,341,737

NAILING MACHINE Jabra P .Nelsow Feb. 1'5, 1944. J. P. NELSON 2,341,737

NAILING MACHINE Inventar Jaim- P Nelsmb QM @L Feb. l5, 1944. J. P. NELSON y 2,341,737

NAIVLING MACHINE Filed Oct. l2, 1942 7 Sheets-Sheet 3 5 .Jabra P Nelow Feb. l5, 1944.

J. P. NELSON 2,341,737

NAILING MACHINE Filed Oct. 12, 1942 7 Sheets-Sheet v4 /z l? es Y,

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l l l I (E [j 5 Inventor l Joh/7a 7? Nelsow l El By wh WWW Feb. 15, 1944. J, P NELSQN 1 2,341,737

NAILING MACHINE Filed Oct. l2, 1942 7 Sheets-.Sheet 5 I pi 75 I 7? sa L G0 a4 4 46 j a L J 4s l .9 7 /30 l ,56|

Allorllejg Feb. l5, 1944. J. P. NELSON NAILING MACHINE Filed Oct. 12, 1942 7 Sheets-Sheet 6 By and Feb. 15, 1944. 1 P NELSON 2,341,737

NAILING MACHINE Filed Oct. 12, 1942 7 Sheets-511881'. '7

John, Plvelson/ waaf@ Patented Feb. 15, 1944 NAILIN G MACHINE John l?. Nelson, Wausau, Wis.

Application October 12, 1942, Serial No. 461,742

3 Claims.

prising common means for manually actuating a driving hammer and for automatically feeding the brads, one at a time, to said hammer.

Another very important object of the invention is to provide a machine of the character described comprising a feed mechanism embodying a novel construction and arrangement whereby jamming will be substantially prevented.

Other objects of the invention are to provide a nailing machine which will be comparatively simple in construction, strong, durable, highly eiiicient and reliable in use, compact, light in weight, and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure l is a view in side elevation of a machine constructed in accordance with the present invention. showing the device in use.

Figure 2 is a top plan View of the machine.

Figure 3 is a view principally in vertical longitudinal section. taken substantially on the line 3--3 of Figure 2. showing the machine in use.

Figure 4 is a cross-sectional view through themachine, taken substantially on the line Elil of Figure 1 Figure 5 a cross-sectional view, taken substantiailyen. the line 5-5 of Figure 3.

Figure i is a view in vertical section through the feed mechanism. taken substantially on the line @-5 of Figure 1.

Figure 7 is a vertical sectional view, taken substantially on the line 'i-T of Figure 6.

Figure 3 is an enlarged fragmentary view in vertical section through the upper portion of the brad elevator and adjacent parts.

Figure 9 is a cross-sectional view, taken substantially on the line 9 9 of Figure 1.

Figure 10 is a view in vertical longitudinal section through the gun, taken substantially on the line Ill-Il) of Figure 2.

Referring now tothe drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a base i. The base l includes an inverted, longitudinal channel bar 2 which terminates in an upturned forward end portion constituting a post 3. The base Ir further includes a crosshead 4 on the forward portion of the bar 2. Mounted for vertical adjustment beneath the crosshead 4 is a shoe 5. As best seen lin Figure 5 of the drawings, bolts 6 are anchored in the shoe 5 and extend slidably through the crosshead 4. Coil springs 1 are engaged with nuts and washers 8 on the bolts 6 for yieldingly urging the shoe 5 upwardly beneath the crosshead 4 and the bar 2. Adjusting screws 9 are threaded through the end portions of the crosshead 4 and engaged with metallic plates I0 on the shoe 5 for raising or lowering the forward end of the machine on the work. A removable bar Il is secured longitudinally at il beneath the bar 2 rearwardly of the shoe 5. The elements 5 and II are adapted to slidably support the machine on the members I2.of a conventional door I3. The usual stops for the lights I4 of the door I3 are indicated at I5. Bars II of any desired length may be used for extending the length of the base 'structure l as may be necessary to bridge various spaces between the members i2 of the work.

Mounted for swinging movement in a vertical plane on the base i is a gun I6. The gun i6 includes a forwardly inclined, dovetail guide il which is pivotally mounted at i8 on the rear end portion of the bar 2. Projecting forwardly and downwardlyfrom the guide i1, adjacent one side of the bar 2, is an arm i9. A barrel 2U is mounted on the forward end portion of the arm i9. Threaded into the forward end portion of the barrel 20 and adapted to be pressed against the stop to be secured is a nose 2 I. Rising from the nose 2i is a feed tube 22 which communicates with the bore 23 of said nose. The feed tube 22 tapers toward its lower end. Projecting at an inclination from the upper end of the feed tube 22 is a forwardly directed lip 24, the purpose of which will be presently set forth. The bore 23 of the l nose 2l is closed adjacent its forward end by a for in the guide l1. A coil spring 3|) has one end connected to the pin 28 and its other end connected to a plate 3| on the rear of the guide I1 for retracting the block 26.

Fixed on one side of the block 26 is a guide 32. The stem 33 of a hammer or plunger 34 extends slidably through the guide 32,4 said plunger being operable in the barrel 20. Projecting from the head 34 of the plunger is a pin 35 which is operable in the bore 23 of the nose 2| for ejecting therefrom a brad 36 for driving said brad past the ball into the work. The driving stroke of the plunger 34 and consequently the set of the brad in the work may be regulated as desired through the medium of nuts 31 which are threaded for adjustment on the rear end portion of the stem 33. A coil spring 38 encircles the stem 33 and has one end engaged in the guide 32 and its other end engaged with the head of the plunger 34 for actuating said plunger on its driving or power stroke. A shock absorbing washer 39 is provided on the plunger stem 33 between the guide 32 and the nuts 31.

Pivotally mounted at 46 (Figure 10) for swinging movement in a vertical plane on the barrel 28 is a latch 4|. The latch 4| comprises, at an intermediate point, a lug or nger 42 which extends through an opening into the barrel 20 for engagement with the plunger 34 for releasably securing said plunger against actuation by the coil spring 38. At its free end, the latch 4| is beveled in a manner to provide a cam 43 which is adapted to ride up on the portion 44 of the guide 32 when the handle 21 is moved forwardly for releasing the plunger 34 after the tension of the coil spring 38 has been built up. Mounted on the side of the bar 2 which is remote from the arm I9 is a keeper 45. The keeper 45 is engageable over a. roller 46 (see Fig. 2) which is rotatably mounted on the adjacent side of the block 26 for positively 40 preventing upward swinging movement of the gun 6 except when the slidable elements thereof are in retracted position.

Removably mounted on the upper portion of the post 3 and projecting rearwardly therefrom is a stationary shaft 41. A stationary disk 48 is removably secured on the rear end portion of the. shaft 41. Rotatably mounted on the shaft 41 is a drum 49 which encircles the disk 48 in spaced relation to the periphery thereof, said drum including a front plate 50. Fixed on the plate 50 is a hopper 5| for the reception of a supply of conventional brads. Toward this end, the hopper 5| is provided with a pivoted closure 52. A ratchet gear 53 is fixed on the front of the hopper 5| and rotates on the shaft 41.

Journaled for swinging movement on the shaft 41, between the ratchet gear 53 and the post 3, is an arm 54. A lever 55 is pivotally mounted on the lower portion of the post 3. A rod 56 operatively connects the slidable block 26 to the free end portion of the lever 55.- An adjustable link 51 operatively connects the lever 55 to the arm 54. A pawl 58 on the arm 54 is engaged by a spring 58 with the ratchet gear 53 for intermittently rotatingthe hopper 5| and the drum 49. A spring pressed dog 59 on the post 3 below the shaft 41 is engaged with the ratchet gear 53 for preventing retrograde rotation of the hopper 5| and the drum 49. It will thus be seen that the hopper 5| and the drum 49 are operatively connected to the manually operable handle 2-1 for rotation thereby in a stepbystep fashion.

Mounted in the drum 49 for rotation therewith is a brad elevator 60 comprising a ring 6| which may be deposited in the-elevator ring 6 is xed on the plate 50. The disk 48 closes the rear end of the ring 6|. The ring 6| includes a peripheral ange 62. Immediately adjacent the iiange 62, the ring 6| has formed therein a plurality of circumferentially extending, spaced slots 63 for the reception of the brads, as at 64. It will be observed that the slots 63 are of a width to prevent the passage of the heads ofthe brads 64. The hopper 5| lcommunicates with the interior of the brad elevator 60 through an opening 65 in the plate 50. is in lowered position, the brads flow by gravity into the elevator ring 6| from the hopper 5|. A circumferentially extending return chute 66 is provided on thel hopper 5| for excess brads that The return chute 66 communicates with the elevator 60 through an opening 61 in the plate 50 which is located at a point substantially diametrically opposite the opening 65.

Fixed in the rear portion of the drum 49 is an internally toothed, annular ratchet 68. At circumferentially spaced points, the rear portion of the drum 49 is struck inwardly in a manner to provide cams 69. Between the cams 69, pins 10 project rearwardly from the periphery of the drum 49. The purpose of the members 68, 69 and 10 will also be presently set forth.

As illustrated to advantage in Figures 5, 'l and 8 of the drawings, a vertical tube 1| is mounted on the upper front portion of the disk 48. A passage 12 in the disk 48 communicates with the'tube 1| at its lower end. Projecting laterally from the upper portion of the tube 1| is a pair of wings 13. A pivoted, spring pressed plate 14, operable between the wings 13, constitutes a yieldable upper wall portion for the tube 1|. A suitable spring 15 yieldingly engages the plate 14 with the ring 6|. Also mounted on this portion of the disk 48 is a resilient double hook 16 which rides on the ring 6| above the tube 1|. As`the elevator 6|) carries the brads 64 upwardly in the slots 63 of the ring 6|, the double hook 16 engages the heads'of said brads, causing them to be turned over as the ring 6| rotates, said brads dropping out of said slots 63 into the tube 1|. 'I'he pivotally mounted, spring pressed plate 14 permits any of the brads which may escape the member 16` to pass Without jamming or damaging the machine. An arcuate tongue 11 extends downwardly from the upper portion of the tube 1| and constitutes an auxiliary support for guarding the resilient member 16 against breakage. Mounted on the rear of the disk 48'for receiving the brads from the tube 1| through the passage 12 is a magazine 18. The magazine 18 includes an inclined chute 18 comprising a vibrating lower wall 88 having itslower end portion pivotally secured, as at 8|. A guide 82 on the disk 48 directs the brads into the chute 19 from the passage 12. A guard 83. extends over the guide 82 from the upper portion of the chute member 80. A chute 84 extends from the upper portion of the chute 19 through the disk 48 for returning excess brads to the elevator 60.

Mounted on a bracket 85 on the upper portion of the vibrating chute wall8n is a clock spring 86. The spring 86 comprises a free outer end portion which projects into the path of the pins 10 for periodically winding and releasing said spring for vibrating the chute wall 80.

Mounted for horizontal movement on the back of the disk 48 above the shaft 41 is a substantially U-shaped slide 81. A lever 88 is pivotally mounted atanv intermediate point, as at 89, on the `rear Thus, when the opening 65 of the disk 48 above the slide 81. On one end of the lever 88 is a shoe 90 which is engageable by the cams 69 for periodically actuating said lever. A rod 9| has one end pivotally connected to the other end portion of the lever 88 and its other end portion extending slidably through one of the legs of the substantially U-shapedgslide 81. A coil spring 92 on the rod 9| yie vdingly connects the slide 81 to the lever 88 for a. tuation in one direction thereby. An adjustable stop screw 93 in the other leg of the slide 81 is engageable with the ,lever 88 for returning` said slide. A finger 94 on the slide 81 is engageable with the upper end portion of the vibrating chute wall 80 for holding same in open position until just before the pins 10 clear and free the vibrating spring 86. Thus, binding of the brads in the chute 19 is prevented.

The magazine 18 further comprises a stationary plate 95 which extends horizontally from the back of the disk 48 at the lower end of the chute 19. The plate 95 has formed therein a slot 96 for the passage of the brads from the chute 19. Mounted beneath the plate 95 in spaced relation thereto is a bottom plate 91. One end only of the plate 91 is secured to the plate 95, as at 98. Slidable between the plates 95 and 91 is an ejector 99. A spring I00,'which is also secured by the bolt 98, yieldingly urges the members 91 and 99 upwardly beneath the platev 95. The ejector 99 projects from one end of the plates 95 and 91 and has formed therein a longitudinal slot |i. The slot I0| accommodates an operating lever 02 which is plvotally suspended at I03 on the back of the disk 48. A thumb nut |04 is provided for frictionally securing the lever |02 'against swinging movement on its pivot |03 when desired, as when the machine is being loaded. A coil spring |05 yieldingly connects the ejector 99 tothe lever |02 for actuation thereby. Mounted on the ejector 99 is a substantially U-shaped bracket |06 which bri'dges the slot |0I. Mounted for sliding adjustment on the bracket |06 is a stop |01 which is engaged with the lever |02 for adjusting the position of said lever relative to the ejector 99. A screw |08 is provided on the bracket |06 for adjusting the stop |01.

Mounted laterally on the free end portion of the lever |02 is a roller |09 (see Fig. 3). The roller |09 is also engageable by the cams 69 for actuating the ejector 99 in a manner to discharge from the magazine 18 the lowermost brad of the column of brads in the chute 19. A return spring |I0 for the lever |02 and the ejector 99 is connected to the adjacent end portion of the lever 88.

Pivotally mounted on the magazine 10 is a dog III which is operable by the annular ratchet 68. Pivotally mounted on the magazine 18 below the member III is a lever H2. A link II3 connects one end of the lever H2 to the dog I I I. Mounted on the other end portion of the lever I|2 is a. screw H4 which is adapted to strike beneath the adjacent end portion of the plate 95 for vibrating same in a manner to further prevent jamming of the brads in the magazine. A coil spring I|5 connects said other end portion of the lever ||2 to the dog I I I. From the foregoing it will be seen that when the dog III is swung upwardly by one of the teeth of the ratchet 68, the lever ||2 is actuated in a direction to swing the screw 4 away from the plate 95 and tension the spring IIE. Thus, when the dog III is released, the spring I|5 causes the screw I|4 to strike the plate 95 a sharp blow. From the foregoing it will be observed that the elements |I2 and I|4 constitute what may be considered a vibrating ham- Iller.

The outer vertical side plate I I6 (Figures 3 and 4) of the magazine 18 has formed therein an opening I|1 for access to the chute 19. A spring pressed closure II8 for the opening ||1 is pivotally mounted on the plate ||6. The closure ||8 is slidable on its pivot ||9 toward and away from the .plate ||6. A spring |20 on the pivot |I9 yieldingly engages the closure ||8 with thc plate |I6.

The ejector 99 deposits the brads in an inclined trough |2| which depends from the magazine 18. Pivotally mounted on the lower end portion of the trough I2|v and adapted to receive the brads therefrom is a discharge nozzle |22. The nozzle |22 is adapted to be swung downwardly for discharging the brads into the tube 22 of the gun I6. A return spring |23 is provided for the nozzle |22. The pivot |24 of the nozzle |22 also carries a substantially U-shaped closure |25 for said nozzle. A return spring |26 connects the closure |25 to the nozzle |22. v

Projecting from the bi-ght portion of the closure |25 is a stop pin |21 which is engageable with the lip 24 on the tube 22 for arresting said closure |25 for opening the nozzle |22, as said nozzle continues across the mouth of said tube 22, at which time the spring |26 is tensioned.

Fixed on the pivotedend of the nozzle |22 is a depending arm |29. Mounted on the operating rod 56 is a bracket |30. Pivotally mounted on the bracket |30 is a pawl |3I. A stop lug |32 on the bracket |30 positively limits swinging movement of the pawl I3| in one direction. A return spring |33 is connected to the pawl |3|.

It is thought that the operation of the machine will be readily apparent from a consideration of the foregoing. Briefly, when the handle 21 is pushed forwardly and downwardly, the coil spring x38 is compressed by the guide 32. This continues until the portion 44 of the guide 32 engages the cam 43 of the latch 4| and raises said latch. thereby freeing, the plunger 34. When thus released, the plunger 34 is actuated by the spring 38 for driving the brad 36 into the work. As hereinbefore mentioned, the set of the brad may be regulated as desired through the medium of the adjustable nuts 31. The handle 21, the plunger 34, et cetera, are then retracted and the latch 4| again drops to operative position. The machine is then moved to its next position on the door. The gun I6 may be readily swung upwardly on the pivot I8 sufliciently to clear cross members on the door. However, this is positively prevented by the engagement of the keeper 45 with the roller 46 while the block 26 is in its forward or projected position.

When the handle 21 is moved forwardly, the drum 49 with the hopper 5| thereon is rotated one step in a clockwise direction through the elements 56, 55, 51, 54, 58, et cetera. When the opening 65 in the plate 50 is disposed downwardly, the brads ow by gravity from the hopper 5| into the elevator 60. The rotary movement of the drum 49 and the jarring action of the hammer I6 causes these brads to slip by gravity through the slots 63 in a manner to be suspended by their heads on the ring 6I. The brads are thus carried upwardly until they reach the position shown to advantage in Figure 8 of the drawings where they are deposited in the tube 1| by the member 1.6 in the manner hereinbefore described. Headless brads which slip through the slots 63 are discharged from the machine through an outlet |34 which is provided therefor in the periphery of the drum 49. Excess brads which may enter the elevator 60 are returned to the hopper 5| through the circumferentially extending chute 66 when the opening 61 in the plate 50 reaches its lowered position. The brads drop by gravity in the tube 1| and are deposited in the chute 19 of the magazine 18. These brads are discharged, one at a time, with each stroke of the lever |02 into the trough |2| by the slidable ejector 99.

The nozzle |22 is normally held in itsA raised position out of communication with the tube 22 by the spring |23. In this position, the nozzle |22 is held in closed position in the closure |25 by the spring |26. Upon forward movement of the rod 56 with the handle 21, the spring |33 permits the pawl |3| to swing in a manner to pass the arm |29. However, on the return movement of the rod 56, the pawl |3| engages the stop lug |32 under the inuence of the spring |33 and is arrested thereby. Thus, the pawl |3| engages the arm |29 and swings the nozzle |22 downwardly. together with the closure |25. The closure |25 is arrested by the engagement of the pin |21 with the lip 24 on the tube 22 but the nozzle- |22 continues to a position over said tube. Thus, the nozzle |22 is opened and the brad therein drops into the tube 22 and is deposited in the bore 23 of the nose 2| of the gun.

The pawl |3| on the now returning operating rod 56 then clears and releases the arm |29 for permitting the spring |23 to return the nozzle |22 to its raised position, during which movement the closure |25 is returned to operative position n said nozzle by the spring |26. The bracket |30 is secured on the rod 56 by screws |28. The construction is such that the bracket |30, with the pawl |3| thereon, may be readily adjusted on the rod 56 relative to the arm |29.

It is believed that the many advantages of a portable nailing machine constructed in accordance with the present invention will be readily understood, and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

1. A nailing machine comprising a base slidably engageable on a piece of Work, a driving gun pivotally mounted for swinging movement in a vertical plane on the base, said gun including slidable operating means, means for securing the gun-against swinging movement on the base when the operating means is in one position, and means on the base operable by said operating means for feeding brads to the gun.

2. A nailing machine comprising a base, a guide pivotally mounted on said base, an arm on said guide, a barrel mounted on said' arm, a driving plunger operable in the barrel, a coil spring for driving said plunger, manually operable means slidable on the guide for tensioning the spring and for disengagingthe latch from the plunger, means for releasably securing the guide against swinging movement on the base when the firstnamed means is in one position, and means on lthe base operable by said rst-named means for feeding brads to the barrel.

3. A nailing machine comprising a base, a driving gun mounted on said base, a stationary disk mounted on the base, a. hopper for the reception of brads rotatably mounted on the base, a drum rotatable on the base with the hopper and communicating therewith for receiving brads therefrom, a vibrating magazine mounted on the disk, a rotary elevator for the brads in the drum, means for delivering the brads by gravity from said elevator to the magazine, coacting means on the magazine and the drum for vibrating said magazine, and means for delivering the brads from the magazine to the gun.

JOHN P. NELSON. 

